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Likewise, kinesin molecules don't have knees or leg muscles and don't really "walk" using gravity (as much as the Intelligent Design idiots will try to describe it that way). However, in a system where every lose molecule is flying all over in Brownian motion, you can get simple directional transport if you have any means that makes it harder to move backward, because then forward is for free. You don't get that from an animation that leaves out all the jiggling (beloved of Feynman), but if you could see that jiggling, you would understand how much, much, simpler (but slower and less efficient) means could have been there doing the job long ago in Evolution, i.e. no Irrefutable Perplexity.

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